sync_turn now writes each completed turn through the SDK's documents.add,
keyed by custom_id "<session>_<date>_b<0-5>" so all turns of a session in
one 4-hour window append to a single document. This matches the capture
shape of the other Supermemory agent integrations and removes the raw
urllib POST to /v4/conversations, which the self-hosted server does not
implement (#101270).
Failed turn writes stay pending and are retried with the next turn, at
session end, on session switch, and at shutdown. Previously a failed
session-end ingest was logged once and the whole session was lost.
Inline base64 data URIs in captured text are replaced with "[image]" so
pasted screenshots no longer land in the document as megabytes of text.
Metadata stays type/session_id/timestamp plus the existing sm_source.
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